Ti含量对Nb-Si-Mo-Ti系合金组织性能影响的研究

研究Ti含量对Nb-Si系合金组织及性能的影响。以机械球磨和SPS烧结技术结合的方法对Nb-16Si-10Mo-xTi（x=0,2,4,6,8,10）合金进行制备，并对x不同时的合金在室温、1200℃时的组织及力学性能进行探究。结果表明：Ti含量增多，Tiss韧性相逐渐增多并聚集，组成相包括Nbss、Nb5Si3和Tiss相，室温下，合金弯曲强度，断裂韧性等有所提高，硬度下降，抗压强度先降后增，x=0时，抗压强度最高为2300MPa ，而Nb-Si-Mo-Ti系合金抗压强度最高为2200Mpa，且断裂方式由脆性断裂转变为复合断裂；1200℃下，抗压强度先降后增，x=0时，最高为605MPa，随Ti含量增加，Nb-Si-Mo-Ti系合金抗压强度最高可达470MPa，同时有较好塑韧性。1200℃压缩后，组织细化，韧性相沿垂直于压缩方向拉长，硬脆相则被挤压到韧性相内部或表面分布。

Study on effect of Ti content on microstructure properties of Nb-Si-Mo-Ti alloy

The effect of Ti content on the microstructure and properties of Nb-Si alloy was studied. Nb-16Si-10Mo-xTi (x=0,2,4,6,8,10) alloy was prepared by means of mechanical ball milling and SPS sintering technology. The mi-crostructure and mechanical properties of x different alloys at room temperature and 1200℃ were investigated. The results show that: As the content of Ti increases, the ductile phase of Tiss gradually increases and gathers, and the constituent phases include Nbss, Nb5Si3 and Tiss phases. At room temperature, the bending strength and frac-ture toughness of the alloy increase, the hardness decreases, and the compressive strength decreases first and then increases. When x=0, the maximum compressive strength is 2300MPa. The highest compressive strength of Nb-Si-Mo-Ti alloy is 2200Mpa, and the fracture mode changes from brittle fracture to composite fracture. At 1200℃, the compressive strength decreases first and then increases. When x=0, the highest compressive strength is 605MPa. With the increase of Ti content, the highest compressive strength of Nb-Si-Mo-Ti alloy can reach 470MPa, and it has good plastic toughness. After compression at 1200℃, the microstructure is refined, the toughness phase is elongated perpendicular to the compression direction, and the hard and brittle phase is extrud-ed to the interior or surface of the toughness phase.